1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ss7ja [257]
2 years ago
15

A money box contains only 10-cent and 20-cent coins. There are 40 coins with a total value of $6.50. How many coins of each?

Mathematics
2 answers:
Gekata [30.6K]2 years ago
7 0

Let's assume that all the coins are 10-cent coins.

The total value would be 10 x 40 = 400 cents = $4

So, it would be $2.5 less than the actual total value,

We now know that not all the coins are 10-cent coins, so now we will replace 1 10-cent coins with a 20-cent coins.

Everytime we switch a 1 10-cent coins to a 20-cent coins, the value go up 10 cents. So, we need to switch 25 times (to make the value goes up $2.5)

-> There are 25 20-cent coins and 15 10-cent coins

Recheck : 25 x 20 + 15 x 10 = 500 + 15 = 650 cents = $6.5

tamaranim1 [39]2 years ago
6 0

Answer:

10x+20y= 350

Step-by-step explanation:

Add the decimal. 3.50

You might be interested in
The distance on a bike path between Westfield and Southborough is 46 mi. Tracey leaves Westfield heading to Southborough cycling
ipn [44]

Answer: 2 hr.

Explanation: Think back to rate of change. <em>d</em> = <em>rt</em>, <em>r</em> = <em>d/t</em>, <em>t</em> = <em>d/r</em>. In this case, we will be using <em>d</em> = <em>rt</em>. Mph would be <em>r</em>, rate, so you would categorize 15 mph and 8 mph under rate. <em>t</em> should represent the time each cyclist traveled. Tracey's and Emma's distance, <em>d</em>, would be the same as their mph, hence Tracey's being 15<em>t</em> and Emma's would be 8<em>t</em>. When you add Tracey's distance plus Emma's distance, you end up with 46 mi. Now, you need to combine like terms, which should look like 15<em>t</em> + 8<em>t </em> = 46. Add 15 and 8 to get 23, so it should be 23<em>t</em> = 46 now. Then, divide both sides of the equation by 23 and now you should have your answer, <em>t</em> = 2 hr.

8 0
3 years ago
Read 2 more answers
Santino traveled 168 miles in 2.5 hours to visit the Kalahari Water Park. What is the unit rate, in miles per hour, that Santino
Nata [24]

Answer:

67.2mph

Step-by-step explanation: you do 168 divide by 2.5

6 0
2 years ago
I need this asap pleasee!
miv72 [106K]

Answer:

The answers are below

Step-by-step explanation:

The greater sign is > and the less then symbol is <

Using the red arrows on the number line, you can tell which one is bigger or less. The dot is colored in so it has to have a line under it. So for the first one (top, left), The red arrow is pointing to the right side meaning x is bigger than 3. Therefore x ≥ 3.

In the next one (top, right) the arrow is pointing to the negative side so that one must be less than 3. The dot is also colored in meaning it is: x ≤ 3

In the next one (bottom, left) the arrow is pointing to the right, the dot not colored in, so it has no line. Therefore it is  x > 3

Last one (bottom right) the arrow is pointing left, dot is white meaning that the answer is x < 3

If you're wondering what the open dots and closed dots mean:

An open dot is used to show that the ray's endpoint is not a component of the solution when the inequality is "strict" ( < or >).

A closed dot is used to denote that the endpoint is a component of the solution for the other types of inequalities (≥ and ≤ ).

6 0
2 years ago
How do I solve N(1/5) = 2/15
dem82 [27]
N(1/5) = (2/15)
divide both sides by (1/5)
n = (2/15)/(1/5)
to divide fractions, cross multiply, e.g. (2*5)/(15*1) = 10/15
n = 10/15 = 2/3 or 0.666666.
8 0
3 years ago
Read 2 more answers
I need help with this there is part a and b
Alex17521 [72]

Answer:

the answer should be 3.914 or 4

Step-by-step explanation:

hope it helps!

I am guessing that Part A: 3.914

and                          Part B: 4

6 0
3 years ago
Other questions:
  • Let $f(x) = 2x + 7$ and $g(x) = 3x + c$. find $c$ if $(f \circ g)(x) = (g \circ f)(x)$ for all $x$.
    8·1 answer
  • (5x – 3y) (3x + 4y)​
    7·2 answers
  • 2. Eric had $197 in his savings account before he was paid his weekly salary. His current
    12·2 answers
  • Can someone please help You have to solve the proportions .<br> Thanks
    13·2 answers
  • Solve the equation tanxtan(x – 45°)=0 for 0° &lt; x &lt; 360°.
    13·1 answer
  • The formula for finding the volume of a rectangular prism is V = Bh. A rectangular prism with dimensions _________ will have a v
    15·1 answer
  • What is the sale price of jeans which regularly cost $28, but now are 10% off ?
    5·2 answers
  • Please help me I need it
    12·2 answers
  • Which characteristics describe the scatterplot? check all that apply.
    13·1 answer
  • Drag the point around to graph more horizontal lines. What is the general equation of a horizontalline?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!